<template>
	<view class="swiper">
		<swiper class="card-swiper" :class="dotStyle?'square-dot':'round-dot'" :indicator-dots="true" :circular="true"
			:autoplay="true" interval="5000" duration="500" @change="cardSwiper" indicator-color="#8799a3"
			indicator-active-color="#0081ff">
			<swiper-item v-for="(item,index) in swiperList" :key="index" :class="cardCur==index?'cur':''"
				@click="gomusic(item.id,item.musicUrl)">
				<view class="swiper-item">
					<image :src="item.imgUrl" mode="aspectFill" v-if="item.type=='image'"></image>
					<video :src="item.imgUrl" autoplay loop muted :show-play-btn="false" :controls="false"
						objectFit="cover" v-if="item.type=='video'"></video>
				</view>
			</swiper-item>
		</swiper>
	</view>
</template>

<script>
	//引入调用公共方法中间文件
	import foo from "@/config/goMusics.js"
	import pro from "@/config/pro.js"
	export default {
		data() {
			return {
				cardCur: 0,
				swiperList: [],
				dotStyle: false,
				towerStart: 0,
				direction: ''
			};
		},
		onLoad() {

			this.TowerSwiper('swiperList');
			// 初始化towerSwiper 传已有的数组名即可
		},
		mounted() {
			this.getSwiperList();
		},
		methods: {
			//调用公用的播放方法
			gomusic(musicID,path) {
				foo.$emit("gotomusic",musicID,path);
			},
			
			getSwiperList(){
				var c1 = new wx.cloud.Cloud({
					resourceEnv: 'prod-0g36g611fc13d81b'
				})
				c1.init()
				c1.callContainer({
					config: {
						env: "prod-0g36g611fc13d81b"
					},
					path: "/musics/swiperList",
					header: {
						"X-WX-SERVICE": "springboot-3fzy",
						"content-type": "application/json"
					},
					"method": "GET",
					"data": "",
					success: (res) => {
						this.swiperList = res.data.data
						this.swiperList.forEach(function(item) {
							item.imgUrl=pro.imagePrefix+item.imgUrl;
						})
					}
				})
			},

			DotStyle(e) {
				this.dotStyle = e.detail.value
			},
			// cardSwiper
			cardSwiper(e) {
				this.cardCur = e.detail.current
			},
			// towerSwiper
			// 初始化towerSwiper
			TowerSwiper(name) {
				let list = this[name];
				for (let i = 0; i < list.length; i++) {
					list[i].zIndex = parseInt(list.length / 2) + 1 - Math.abs(i - parseInt(list.length / 2))
					list[i].mLeft = i - parseInt(list.length / 2)
				}
				this.swiperList = list
			},

			// towerSwiper触摸开始
			TowerStart(e) {
				this.towerStart = e.touches[0].pageX
			},

			// towerSwiper计算方向
			TowerMove(e) {
				this.direction = e.touches[0].pageX - this.towerStart > 0 ? 'right' : 'left'
			},

			// towerSwiper计算滚动
			TowerEnd(e) {
				let direction = this.direction;
				let list = this.swiperList;
				if (direction == 'right') {
					let mLeft = list[0].mLeft;
					let zIndex = list[0].zIndex;
					for (let i = 1; i < this.swiperList.length; i++) {
						this.swiperList[i - 1].mLeft = this.swiperList[i].mLeft
						this.swiperList[i - 1].zIndex = this.swiperList[i].zIndex
					}
					this.swiperList[list.length - 1].mLeft = mLeft;
					this.swiperList[list.length - 1].zIndex = zIndex;
				} else {
					let mLeft = list[list.length - 1].mLeft;
					let zIndex = list[list.length - 1].zIndex;
					for (let i = this.swiperList.length - 1; i > 0; i--) {
						this.swiperList[i].mLeft = this.swiperList[i - 1].mLeft
						this.swiperList[i].zIndex = this.swiperList[i - 1].zIndex
					}
					this.swiperList[0].mLeft = mLeft;
					this.swiperList[0].zIndex = zIndex;
				}
				this.direction = ""
				this.swiperList = this.swiperList
			},
		}
	}
</script>

<style>
	.tower-swiper .tower-item {
		transform: scale(calc(0.5 + var(--index) / 10));
		margin-left: calc(var(--left) * 100upx - 150upx);
		z-index: var(--index);
	}
	
</style>